5.15-stable review patch. If anyone has any objections, please let me know.
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From: Heiner Kallweit hkallweit1@gmail.com
commit eabb8a9be1e4a12f3bf37ceb7411083e3775672d upstream.
This reverts commit 7274c4147afbf46f45b8501edbdad6da8cd013b9.
Ken reported that RTL8125b can lock up if gro_flush_timeout has the default value of 20000 and napi_defer_hard_irqs is set to 0. In this scenario device interrupts aren't disabled, what seems to trigger some silicon bug under heavy load. I was able to reproduce this behavior on RTL8168h. Fix this by reverting 7274c4147afb.
Fixes: 7274c4147afb ("r8169: don't try to disable interrupts if NAPI is scheduled already") Cc: stable@vger.kernel.org Reported-by: Ken Milmore ken.milmore@gmail.com Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Reviewed-by: Eric Dumazet edumazet@google.com Link: https://lore.kernel.org/r/9b5b6f4c-4f54-4b90-b0b3-8d8023c2e780@gmail.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/realtek/r8169_main.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -4617,10 +4617,8 @@ static irqreturn_t rtl8169_interrupt(int rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING); }
- if (napi_schedule_prep(&tp->napi)) { - rtl_irq_disable(tp); - __napi_schedule(&tp->napi); - } + rtl_irq_disable(tp); + napi_schedule(&tp->napi); out: rtl_ack_events(tp, status);